Medical oxygen concentrator



FIG. 1 is a front perspective view of a medical oxygen concentrator showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines are directed to environment and form no part of the claimed design. The unshaded surface that directly adjoins the claimed solid line edge forms no part of the claimed design. 

CLAIM The ornamental design for a medical oxygen concentrator, as shown and described. 